【Expandable and Portable】This cat backpack has a foldable and expandable design. It can increase 91% of the space after expansion as a tent bed, and be folded easily with a folded size of 3*12*17 inches. The cat backpack carrier is airline approved which could be folded and stored under the seat. The size of the cat carrier backpack is 12*10*17 inches, suitable for cats weighted below 14lb and dogs, puppies weighted below 10lb. 【Breathable, Visible and Washable】The four-sided ventilated mesh windows of the pet backpack can provide the cat with the best air permeability and upward vision. There is a soft and washable bottom plate at the bottom of the pet carrier backpack , which provides better comfort for your pet while hiking, traveling camping, biking, and outdoor walking. 【Comfortable and Double Safety Security】Front window of the dog backpack carrier can be opened by you and let your cat head out when your lovely pets are nervous. But all the zippers in the top, bottom and front have safety locks to protect the door being opened by your pets. Furthermore, the built-in safety belt of the dog hiking backpack can be tied to a collar or cat vest to prevent your pets from escaping.